东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (2): 201-208.DOI: 10.12068/j.issn.1005-3026.2024.02.007

• 材料与冶金 • 上一篇    

石墨添加剂对磁流变脂流变特性的影响

董继强, 叶绪丹, 毛润松, 王炅   

  1. 南京理工大学 机械工程学院,江苏 南京 210094
  • 收稿日期:2022-09-09 出版日期:2024-02-15 发布日期:2024-05-14
  • 作者简介:董继强(1998-),男,安徽合肥人,南京理工大学博士研究生
    王 炅(1964-),男,江苏南京人,南京理工大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(52075264)

Effects of Graphite Additives on Rheological Properties of Magnetorheological Grease

Ji-qiang DONG, Xu-dan YE, Run-song MAO, Jiong WANG   

  1. School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China. Corresponding author: WANG Jiong,E-mail: wjiongz@njust. edu. cn
  • Received:2022-09-09 Online:2024-02-15 Published:2024-05-14

摘要:

为了研究石墨添加剂对磁流变脂流变特性的影响,采用润滑脂为基体,制备了石墨粉末质量分数为0%,2%,5%,8%,10%的石墨磁流变脂(graphite magnetorheological grease,GMRG).使用安东帕流变仪测量了5种材料在稳态剪切模式和振荡剪切模式下的流变特性,并对石墨添加剂质量分数对磁流变脂屈服应力和黏弹性的影响进行了研究.结果表明,对比未添加石墨的磁流变脂,石墨质量分数分别为2%,5%,8%和10%的磁流变脂可以在加载电流为3 A时获得更高的屈服应力,并且屈服应力分别提升了40.49%,54.12%,81.48%和147.48%.此外,石墨添加剂质量分数越大,石墨磁流变脂的黏弹性特征就越明显,但获得的相对磁流变效应越小.研究还发现石墨质量分数的变化对石墨磁流变脂的线性黏弹区间影响不大.

关键词: 磁流变脂, 石墨, 振荡剪切, 流变学, 屈服应力

Abstract:

To study the effect of graphite additive on the rheological properties of magnetorheological grease, graphite magnetorheological grease (GMRG) was prepared. The GMRGs with graphite powder mass fractions of 0%, 2%, 5%, 8% and 10% were prepared using grease as the matrix. The rheological properties of 5 groups of GMRG were measured in steady-state shear and oscillatory shear modes, and the effect of graphite additive mass fraction on yield stress and viscoelasticity was analyzed. The results showed that compared with the magnetorheological grease without graphite powder addition, the GMRG can achieve higher yield stress under the loading current of 3 A. The yield stress of the GMRG was increased by 40.49%, 54.12%, 81.48% and 147.48% with graphite mass fractions of 2%, 5%, 8% and 10%, respectively. In addition, with, the viscoelastic characteristics of the GMRG become more pronounced as the graphite mass fraction increase, but the relative magnetorheological effect achieved by the GMRG becomes smaller. The mass fraction of graphite does not affect the linear viscoelastic range of the GMRG was also found.

Key words: magnetorheological grease, graphite, oscillatory shear, rheology, yield stress

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